A chemical A is used for the preparation of washing soda to recover ammonia. When CO2 is bubbled through an aqueous solution of A, the solution turns milky. It is used in white washing due to disinfectant nature. What is the chemical formula of A ?
(i) Ca(HCO3)2
(ii) CaO
(iii) Ca(OH)2
(iv) CaCO3
A chemical A is used for the preparation of washing soda to recover ammonia. When CO2 is bubbled through an aqueous solution of A, the solution turns milky. It is used in white washing due to disinfectant nature. What is the chemical formula of A ?
(i) Ca(HCO3)2
(ii) CaO
(iii) Ca(OH)2
(iv) CaCO3
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1 Answer
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This is a multiple choice type question as classified in NCERT Exemplar
Correct Option (iii)
The chemical formula of A is Ca (OH)2 Sodium carbonate is prepared by Solvay's process. In this process, ammonia is recovered when ammonium chloride reacts with calcium hydroxide. On reacting NH4Cl with Ca (OH)2, calcium chloride is obtained as a by-product. The reaction is given below.
2NH4Cl+Ca (OH)2→2NH3+CaCl2+H2O
When CO2 is bubbled through an aqueous solution of Ca (OH)2 the solution turns milky. It is used in whitewashing due to its disinfectant nature.
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Li+ has the highest hydration enthalpy.
Hence it is most hydrated
Therefore, Correct order of hydrated radii is Cs+ < Rb+ < K+ < Na+ < Li+
Sodium carbonate is a white crystalline solid which exists as a decahydrate, 
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